Answer
$(\Delta K) / K=0.28$
Work Step by Step
The mass of a carbon atom is $12 \mathrm{u}$, so
$
(\Delta K) / K=4(1.0 \mathrm{u})(12 \mathrm{u}) /(12 \mathrm{u}+1.0 \mathrm{u})^2\\=0.28
$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.